Kenko MC7 AF 2x Teleplus converter gives you the dramatic effect of doubling the focal length. KENKO AF Teleplus converters have genuine Gated Array IC. This means that not only the converters own data but all data sent from the camera body provide full exposure metering and electronic flash photography. Auto focus is retained with lens that have a maximum aperture of F/4 or brighter. (Manual focusing will be required with lenses of smaller aperture)